When a tall plant was self-pollinated, one-fourth of the progeny were dwarf. The genotypes of the parent and dwarf progenies are

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Dominance in genetics is a relationship between alleles of a gene, in which one allele masks the expression (phenotype) of another allele at the same locus. In this case, where a gene exists in two allelic forms (designated T and t). Allele T is dominant over t.

The genotype of a tall parent could be homozygous TT or heterozygous Tt. But, since on doing it’s self-cross, one-fourth of the progeny obtained has been found to be dwarf. Thus, its genotype must have been Tt.

The genotype of dwarf progeny would be tt. Allele t is recessive; therefore, it would be expressed only in the homozygous state.

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